# Fifth grade second volume mathematics second unit factor and multiple 8 periods preview training

1, pass a sentence.(1) The sum of two even numbers must be odd.The sum of an even number and an odd number must be even.The sum of two composite numbers must be odd.The difference between two adjacent odd numbers is 1. () (5) An odd number multiplied by 2 must be even.() 2.(1)4[]3+75 ()4[] 4 +75 () 5 [] 4 +75(2)63[]-167 () a. must be odd B. must be even C.May be odd, may be even (3)5[][result of]x40 ().a.It must be odd b. it must be even C. It may be odd or even 3. Put 37 berries in two cartons. If the number of apples in one carton is even, is the number of apples in the other carton odd or even?Why is that?Answer: 1. Judge.(1) The sum of two even numbers must be odd.The sum of an even number and an odd number must be even.The sum of two composite numbers must be odd.The difference between two adjacent odd numbers is 1. (×) (5) An odd number multiplied by 2 must be even.(√) 2.(1)4[]3+75 (2) 5 []3+75(2) the result of []-167 (c)A must be odd B.Must be even C. May be odd, may be even (3)5[][]x40 result (B).a.It must be odd b. it must be even C. It may be odd or even 3. Put 37 berries in two cartons. If the number of apples in one carton is even, is the number of apples in the other carton odd or even?Why is that?It’s odd. Odd one even equals odd